Device for varying the length of a strap for a scuba diving mask or the like

ABSTRACT

A device for regulating the length of the strap ( 3 ) on a scuba diving mask, the mask comprising a frame ( 1 ) for supporting one or two lenses and two fork-shaped portions ( 1   a ) extending from either side of said frame, each containing a pivot ( 15 ) around which a portion of the end ( 3   a ) of the strap is wrapped, said portion of strap being formed with a plurality of transverse stop ribs ( 4 ) on one side. The regulating device comprises a stop lever ( 16 ) housed inside each of the fork-shaped portions ( 1   a ) and a tooth ( 8 ) extending from the lever for engaging with one of the ribs. The lever comprises a substantially U-shaped member ( 6 ) and a tongue ( 7 ) extending from the base ( 6   a ) of the U-shaped member so that it is coplanar and cantilevered inside it, the tooth ( 8 ) extending transversely from the tongue ( 7 ). On the side opposite the tooth, a head ( 10 ) extends from the tongue, against which a wedge-shaped portion ( 26 ) of a button ( 25 ) abuts, sliding with respect to the fork-shaped portion on a plane parallel to the U-shaped member, whereby, when the button is pressed, the head is caused to slide away from the U-shaped member, with a consequent lifting of the tongue and the disengagement of the tooth from the stop rib ( 4 ).

DESCRIPTION FIELD OF THE INVENTION

The present invention relates generally to a device for regulating the length of the strap normally attached to a scuba diving mask to enable it to be fitted over the diver's head.

Scuba diving masks are known to comprise a frame, to which one or two lenses are attached with a watertight seal, a soft facepiece extending from the edge of the frame to create a seal against the diver's face, and a flexible strap, the two ends of which are connected to the two opposite sides of the frame, and the length of the strap is adjustable so as to exert sufficient tension to ensure its stable positioning against the diver's face and an adequate watertightness of the facepiece.

The strap's length is still commonly regulated by means of a buckle, although this is somewhat impractical to use, especially when the diver is wearing gloves, or has cold or wet hands. It is also common to find fastenings that enable the length of the strap to be adjusted without the diver needing to take off the mask. A known solution of this kind involves a strap whose ends wrap around pivots located on fork-shaped side portion of the mask. The strap has transverse stop ribbing, which is engaged by a stop tooth projecting from a lever pressed elastically against said ribs. By overcoming its elastic resistance, this lever can be raised by the user, without taking off the mask, to enable the strap to slide into a new position. Said elastic resistance is created by a spring in some cases, while in others the resilience of the lever itself is exploited, as it is flexed to detach the tooth from the strap to enable the latter to slide. Even with solutions of this type, however, although it is not necessary to take off the mask, regulating the strap is still uncomfortable and tricky, especially if it is done with cold, wet hands—and it cannot be done while wearing gloves because a finger tip is needed to lift the lever to which the stop tooth engaging the strap's ribbing is attached.

U.S. Pat. No. 5,956,778, in the name of the same Applicant, discloses a particularly compact device for regulating the strap, suitable for use on swimming goggles. The device comprises a stop lever and a tooth extending from the lever that engages on a rib on the strap wrapped around an underlying pivot integrally attached to a side portion on the goggles frame. The stop lever comprises a first arm (in particular, in the form of a fork), having a first end pivotally connected to the side portion of the frame and a second end abutting against the bottom of a seat provided in the side portion of the frame, and a second arm, from which said tooth extends transversely, having a free first end for its operation and a second end rigidly connected to the second end of the first arm. In particular, the second arm is a tongue that extends so as to be cantilevered and coplanar to the fork forming the first arm, and it has a raised portion at its free end that can be used to lift the tongue and thus disengage the transverse tooth from the rib on the strap, thereby enabling it to slide.

This solution also suffers from the same drawback as other known solutions, however, i.e. it is difficult to operate the stop lever.

OBJECT AND SUMMARY OF THE INVENTION

The object of the present invention is to provide a device for regulating the length of the strap on a scuba diving mask that can be operated more easily and comfortably than the known devices, even wearing gloves.

This object is achieved by the device for regulating the length of the strap of a scuba diving mask with the essential characteristics set forth in claim 1. Further important features are set forth in the dependent claims.

BRIEF DESCRIPTION OF THE DRAWINGS

The invention will now be illustrated in greater detail in the following description of an embodiment thereof, which is to be intended only as a non-limiting example with reference to the enclosed drawings, wherein:

FIG. 1 shows a schematic side view of a scuba diving mask using the device for regulating the length of the strap according to the invention;

FIG. 2 is a perspective view of the regulating device according to the invention;

FIG. 3 is a plan view of the regulating device according to the invention;

FIG. 4 is a view from above of the side portion of a scuba diving mask frame housing the device according to the invention;

FIG. 5 is a side view of the detail shown in FIG. 4, seen from the direction indicated by the arrow F;

FIG. 6 is a rear view of the detail shown in FIG. 4, seen from the direction indicated by the arrow G.

DETAILED DESCRIPTION OF THE INVENTION

With reference to FIG. 1, the numeral 1 is used to indicate a scuba diving mask frame providing a watertight support for one or two lenses (not shown) and a facepiece 2 made of a soft material extending from the edge of the frame and suitable for adapting the mask to the diver's face, while also ensuring a watertight seal against the face, achieved by adjusting the tightness of the mask against the face by means of a belt or strap 3 that wraps around the diver's head.

The strap 3 has a set of transverse ribs 4 on one side of its terminal portions 3 a, which engage in a device for fastening and regulating the length of said strap generically indicated by the numeral 5.

As illustrated in detail in FIGS. 2 and 3, the regulating device 5 comprises a first, substantially U-shaped member 6, composed of a base 6 a and a pair of brackets 6 b whose expanded tips 6 c extend from the base, remaining coplanar thereto, and a tongue 7 extending from the base 6 a of the U-shaped member 6 between the two brackets 6 b in a position substantially coplanar to said brackets. At the free end of the tongue 7 there extends a transverse tooth 8. The assembly comprising the U-shaped member 6, the tongue 7 and the corresponding tooth 8 constitutes the stop lever 16 for the regulating device according to the present invention.

On the side opposite the transverse tooth 8, there is a column 9 extending from the tongue 7, that is enlarged at one end to form a head 10, on which head (on the side opposite the base 6 a of the U-shaped member 6) there is a surface 11 sloping towards the tongue 7.

With reference also to FIGS. 4, 5 and 6, the stop lever 16 is mounted inside a seat 12 in a fork-shaped side portion 1 a that projects from the frame 1. This portion 1 a comprises a pair of fins 13, with a corresponding pair of coaxial holes 14, with a pivot 15 which is snap-fixed into said holes and the terminal portion 3 a of the strap 3 is wrapped around said pivot.

The seat 12 comes between the two fins 13 and two substantially parallel walls 17 and 18 extending between them. The depth of the seat 12 is such that the base 6 a of the U-shaped member 6 abuts against the bottom of said seat and the expanded tips 6 c on its brackets 6 b abut against ribbing 19 provided along the fins 13 at the inlet to the seat 12, so that once the U-shaped member 6 has snapped into the seat 12, it remains locked therein.

The wall 18, forming the outer side of the seat 12 has a longitudinal slot 20, which is occupied by the column 9 extending from the tongue 7. A further seat 21 is provided beyond the wall 18, contained on the outside by a wall 22 with a relevant longitudinal slot 23 lying above the slot and containing the column 9 so that its enlarged end, or head, 10 projects therefrom.

A plate 24, with one end 25 enlarged in the shape of a button, projects from and is slidingly engaged around the column 9 within the seat 21. Between the button-shaped end and the head 10 situated on the end of the column 9, there is a sloping wall 26 corresponding to the wall 11 under the head 10 and sloping at the same angle. Pressing the button-shaped end 25 of the plate 24 causes the latter to slide in the seat 21, thereby bringing the sloping walls 26 and 11 into contact. Since the head 10 is integral to the lever 16, which cannot slide within its seat 12, said head is forced to slide along the sloping wall 26 of the button 25 with its sloping wall 11, and is thereby lifted. As the head 10 rises, it lifts the tongue 7 and consequently disengages the tooth 8 from the rib 4 on the strap 3, thus enabling the strap to slide around the pivot 15. To return the tooth 10 automatically to engage with the rib 4 when the pressure on the button 25 is released, the plate 24 is elastically forced against the bottom of the seat 21. For this purpose, an arm 27 extends from the end of the plate 24 opposite the button 25 and said arm is bent over to form an arc and suitable for abutting against the bottom of the seat 21 as it flexes under the effect of the pressure induced by the sliding of the plate 24, then returning to its undeformed condition when the pressure is released and thus returning the button 25 to its initial position, when the head 10 is consequently lowered and the tooth 8 re-engages with a rib 4. To prevent the plate 24 from sliding out of its seat 21 at the end of its return stroke, it abuts against the column 9 around which it is installed.

It should be noted that the height of the column 9 is designed so that a minimal effort is needed to make the plate 24 slide and the head 10 rise.

From the above, it is clear that the device for regulating the length of the strap on a scuba diving mask fully satisfies the established aims. In fact, the device can easily be adjusted without taking off the mask, even if the diver is wearing gloves, since the lever that disengages the tooth from the ribbing on the strap is lifted by taking action not directly on the strap, using a tugging action parallel to the movement that disengages the tooth (as in the known solution), but on a button connected to the lever and consequently much more readily accessible in that pressure is exerted in a direction perpendicular to said strap movement, i.e. substantially parallel to the plane on which the end of the strap lies.

It is also worth pointing out that, although the regulating device according to the present invention has been described in relation to a scuba diving mask, it can clearly also be equally advantageously applied to a pair of swimming goggles. 

1. A device for varying the length of strap on a scuba diving mask strap, the mask comprising a frame for supporting one or more lenses and a plurality of fork-shaped portions extending from either side of the frame, each portion having a pivot about which a portion of the strap end is wrapped, the strap portion being formed with a plurality of transverse stop ribs on one side, wherein the device includes a stop lever housed in each of the fork-shaped portions and a tooth extending from the lever for engaging one of the ribs, the lever having a substantially U-shaped member and a tongue extending from the base of the member such that the tongue is coplanar with and cantilevered in the lever, the tooth extending transversely from the tongue; wherein, on a side opposite the tooth, a head extends from the tongue, against which a wedge-shaped portion of a button abuts, sliding with respect to the fork-shaped portion in a plane generally parallel to the U-shaped member, whereby, when the button is pressed, the head slides away from the member, thereby lifting of the tongue and disengaging the tooth from the rib.
 2. The device set forth in claim 1, wherein each of the fork-shaped portions has a first seat for snapingly securing the substantially U-shaped member and a second seat over the first seat for slidingly housing a plate extending from the button, the head being formed at an end of a column extending from the tongue and passing through the second seat, such that the head projects above the seat.
 3. The device set forth in claim 2, wherein the button is elastically biased against the bottom of the second seat.
 4. The device set forth in claim 3, wherein a curved arm extends from the sliding plate of the button and flexibly abuts the bottom of the second seat.
 5. The device set forth in claim 2, wherein the plate is arranged about the column, sliding generally perpendicularly relative to and abutting the column, thereby being prevented from sliding out of the second seat.
 6. The device set forth in claim 2, wherein the fork-shaped portion includes a plurality of relatively parallel fins with coaxial holes for supporting the pivot, the first and second seat extending one above the other, between the fins and delimited by three substantially parallel walls, a plurality of which have a slot for housing the column on the tongue. 